random notes, guides, and thoughts…
April 30, 2016
Last post I mentioned how I got an ESP8266 board. Well, I’ve put together that with a DHT11 and MQTT to create a widget that senses temperature and humidity, then posts that on a regular basis to your MQTT message broker. The data comes out in JSON format for ease of use. I’ll cover the hardware later, once I get the rest of my prototype boards.
April 29, 2016
The ESP8266 is a ridiculously cheap ($2 or so from China), WiFi equipped breakout board which has a 32-bit microcontroller and Flash (1MB) onboard. It comes in a bunch of different versions (mine is an ESP-01), and all with different Flash capacities. The pinout of the one I have appears below;
April 27, 2016
Recently picked up a Ralink 7601 Wifi Adapter (a no-name clone wifi stub from Ebay), for the princely sum of about $2 delivered. It’s identifable easily because in lsusb it shows up as;
April 14, 2016
With the release of LetsEncrypt to the public, I’ve reconfigured my blog server to use HTTPS. Setup was pretty straightforward, I just followed the nginx setup guide. Notably though, my highly restrictive nginx setup didn’t work with the rules they described. Instead, I needed this fragment to get the Let’s Encrypt authentication challenge to pass;
April 11, 2016
The Raspberry Pi running Raspian has some built-in temperature sensors. The sensor is on the CPU die, and you can find it at;
April 1, 2016
Well, that was straightforward. I present you with;